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Prospect on intergalactic magnetic field measurements with gamma-ray instruments

Published online by Cambridge University Press:  18 July 2013

Hélène Sol ,
Andreas Zech ,
Catherine Boisson ,
Henric Krawczynski ,
Lisa Fallon ,
Elisabete de Gouveia Dal Pino ,
Jim Hinton ,
Susumu Inoue ,
Andrii Neronov  and
Richard White
Hélène Sol
Affiliation:
LUTH, Observatoire de Paris, CNRS, Université Paris-Diderot, 5 place Jules Janssen, F-92190, Meudon, France email: helene.sol@obspm.fr, andreas.zech@obspm.fr, catherine.boisson@obspm.fr
Andreas Zech
Affiliation:
LUTH, Observatoire de Paris, CNRS, Université Paris-Diderot, 5 place Jules Janssen, F-92190, Meudon, France email: helene.sol@obspm.fr, andreas.zech@obspm.fr, catherine.boisson@obspm.fr
Catherine Boisson
Affiliation:
LUTH, Observatoire de Paris, CNRS, Université Paris-Diderot, 5 place Jules Janssen, F-92190, Meudon, France email: helene.sol@obspm.fr, andreas.zech@obspm.fr, catherine.boisson@obspm.fr
Henric Krawczynski
Affiliation:
Washington University in St Louis, Physics Department and McDonnell Center for Space Sciences, 1 Brookings Drive, CB 1105, St Louis, MO 63130, USA email: krawcz@wuphys.wustl.edu
Lisa Fallon
Affiliation:
Dublin Institute for Advanced Studies, 31 Fitzwilliam Place, Dublin 2, Ireland email: lfallon@cp.dias.ie
Elisabete de Gouveia Dal Pino
Affiliation:
Instituto de Astronomia, Geofisica e Ciencias Atmosfericas, Universidade de Sao Paulo R. do Matao, 1226, Sao Paulo, SP 05508-090, Brazil email: dalpino@astro.iag.usp.br
Jim Hinton
Affiliation:
Department of Physics and Astronomy, The University of Leicester, University Road, Leicester, LE17RH, UK email: jah85@leicester.ac.uk, rw141@leicester.ac.uk
Susumu Inoue
Affiliation:
Max-Planck-Institut fur Kernphysik, Saupfercheckweg 1 69117 Heidelberg, Germany and Institute for Cosmic Ray Research, University of Tokyo 5-1-5 Kashiwanoha, Kashiwa 277-8582, Chiba, Japan email: inoue@mpi-hd.mpg.de
Andrii Neronov
Affiliation:
ISDC Data Center for Astrophysics, Geneva Observatory, Chemin d'Ecogia 16, 1290 Versoix, Switzerland email: andrii.neronov@unige.ch
Richard White
Affiliation:
Department of Physics and Astronomy, The University of Leicester, University Road, Leicester, LE17RH, UK email: jah85@leicester.ac.uk, rw141@leicester.ac.uk
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Abstract

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Observing high-energy gamma-rays from Active Galactic Nuclei (AGN) offers a unique potential to probe extremely tiny values of the intergalactic magnetic field (IGMF), a long standing question of astrophysics, astroparticle physics and cosmology. Very high energy (VHE) photons from blazars propagating along the line of sight interact with the extragalactic background light (EBL) and produce e+e− pairs. Through inverse-Compton interaction, mainly on the cosmic microwave background (CMB), these pairs generate secondary GeV-TeV components accompanying the primary VHE signal. Such secondary components would be detected in the gamma-ray range as delayed “pair echos” for very weak IGMF (B < 10−16G), while they should result in a spatially extended gamma-ray emission around the source for higher IGMF values (B > 10−16G). Coordinated observations with space (i.e. Fermi) and ground-based gamma-ray instruments, such as the present Cherenkov experiments H.E.S.S., MAGIC and VERITAS, the future Cherenkov Telescope Array (CTA) Observatory, and the wide-field detectors such as HAWC and LHAASO, should allow to analyze and finally detect such echos, extended emission or pair halos, and to further characterize the IGMF.

Keywords

magnetic fieldintergalactic spacegamma-ray astronomypair echospair haloshigh-redshift blazars
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S294: Solar and Astrophysical Dynamos and Magnetic Activity , August 2012 , pp. 459 - 470
Copyright
Copyright © International Astronomical Union 2013 

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